Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6329715b95f14e…

MALICIOUS

PDF

43.1 KB Created: 2020-05-30 22:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: ce738460fa6a8bffe9f27a743442360a SHA-1: b3654c70e180c93a54b8915605f6f95fd6b5dd1d SHA-256: 3d6329715b95f14e9b7548f72cc63ffc5ed5577b14c60b1aa920b39bcccfeffd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are structured as a link farm, suggesting an attempt to manipulate search engine rankings or redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://8b.undesirable.us/uploads/1/3/1/3/131384559/131384559.html#nursing+diagnosis+for+hypokalemia PDF link annotation
    • http://under-pressure-fl.com/uploads/1/3/0/7/130775424/vivapanilivat-gixaromerum-kalubo-powakuloxe.pdfIn PDF document text
    • http://mycruzada.com/uploads/1/3/0/7/130738632/32604f26.pdfIn PDF document text
    • http://katnsag.us/uploads/1/3/1/3/131383588/eb3ca.pdfIn PDF document text
    • http://dawnburridge.com/uploads/1/3/0/4/130483390/kikikuba-mavigi-dajaxema-dozugitufumokaz.pdfIn PDF document text
    • http://amikrecords.com/uploads/1/3/1/0/131071056/damowupokakone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 10648 bytes
SHA-256: 7c3540ae5746f5ac33371907c7759ade02256cf3b281245aa3ba5ea1bdafda30

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